Author: Carlos Lopez <[email protected]>
Date: Fri Nov 23 19:11:34 2012 +0100
Cairo Operators: Add support for blend mode DIVIDE using a custom blend
function.
---
synfig-core/src/synfig/cairo_operators.cpp | 44 ++++++++++++++++++++++++++-
synfig-core/src/synfig/color.cpp | 45 ++++++++++++++++++++++++++++
2 files changed, 88 insertions(+), 1 deletions(-)
diff --git a/synfig-core/src/synfig/cairo_operators.cpp
b/synfig-core/src/synfig/cairo_operators.cpp
index 5a5d862..9247835 100644
--- a/synfig-core/src/synfig/cairo_operators.cpp
+++ b/synfig-core/src/synfig/cairo_operators.cpp
@@ -231,10 +231,52 @@ void cairo_paint_with_alpha_operator(cairo_t* acr, float
alpha, Color::BlendMeth
break;
}
+ case Color::BLEND_DIVIDE:
+ {
+ cairo_push_group(cr);
+ cairo_paint(cr);
+ cairo_pattern_t* pattern=cairo_pop_group(cr);
+
+ cairo_surface_t* source;
+ cairo_status_t status;
+ status=cairo_pattern_get_surface(pattern, &source);
+ if(status)
+ {
+ synfig::info("%s",
cairo_status_to_string(status));
+ return;
+ }
+ CairoSurface csource(source);
+ CairoSurface cdest(cairo_get_target(cr));
+ assert(cdest.map_cairo_image());
+ assert(csource.map_cairo_image());
+
+ double x1, y1, x2, y2, x0, y0;
+ cairo_clip_extents(cr, &x1, &y1, &x2, &y2);
+ cairo_user_to_device(cr, &x1, &y1);
+ cairo_user_to_device(cr, &x2, &y2);
+ x0=x2<x1?x2:x1;
+ y0=y2<y1?y2:y1;
+
+ int w=csource.get_w();
+ int h=csource.get_h();
+ int h0=(int)y0;
+ int w0=(int)x0;
+
+ for(int y=0;y<h;y++)
+ for(int x=0;x<w;x++)
+ {
+
cdest[h0+y][w0+x]=CairoColor::blend(csource[y][x], cdest[h0+y][w0+x], alpha,
method);
+ }
+ csource.unmap_cairo_image();
+ cdest.unmap_cairo_image();
+
+ cairo_pattern_destroy(pattern);
+ break;
+ }
case Color::BLEND_ADD:
case Color::BLEND_SUBTRACT:
case Color::BLEND_DIFFERENCE:
- case Color::BLEND_DIVIDE:
+ case Color::BLEND_COLOR:
case Color::BLEND_ALPHA_BRIGHTEN:
case Color::BLEND_ALPHA_DARKEN:
default:
diff --git a/synfig-core/src/synfig/color.cpp b/synfig-core/src/synfig/color.cpp
index 67d51ae..95d538e 100644
--- a/synfig-core/src/synfig/color.cpp
+++ b/synfig-core/src/synfig/color.cpp
@@ -435,6 +435,51 @@ blendfunc_DIVIDE(C &a,C &b,float amount)
return b;
}
+// Specialization for CairoColor
+template <>
+static CairoColor
+blendfunc_DIVIDE(CairoColor &a, CairoColor &b, float amount)
+{
+ int ra, ga, ba, aa;
+ int rb, gb, bb, ab;
+ int rc, gc, bc, ac;
+
+ ra=a.get_r();
+ ga=a.get_g();
+ ba=a.get_b();
+ aa=a.get_a();
+
+ rb=b.get_r();
+ gb=b.get_g();
+ bb=b.get_b();
+ ab=b.get_a();
+
+ float alpha=amount*aa/255.0;
+ float ahpla=1.0-alpha;
+
+ if(ab==0)
+ return CairoColor();
+
+ ac=ab;
+
+ if(ra==0)
+ rc=255;
+ else
+ rc=(rb*alpha*aa)/ra + ahpla*rb;
+
+ if(ga==0)
+ gc=255;
+ else
+ gc=(gb*alpha*aa)/ga + ahpla*gb;
+
+ if(ba==0)
+ bc=255;
+ else
+ bc=(bb*alpha*aa)/ba + ahpla*bb;
+
+ return CairoColor(rc, gc, bc, ac);
+}
+
template <class C>
static C
blendfunc_COLOR(C &a,C &b,float amount)
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